CUSTOM Shopping Cart for Website

See: [login to view URL] I need a shopping cart added that will allow customers to select a custom pair of jeans.? You will have to customize whatever shopping cart you choose to use since this is more than just a simple addition of a product. The technologies you may use are PHP, PERL, Javascript, MySQL and XML in a linux environment. If bidding, please let me know what shopping cart you will use and a brief description of the customization you will do to it. The final product should use the template that is already on the site. Customers must be able to use a credit card.? You do NOT need to interface with a merchant account gateway.? The client will just run the credit card numbers manually through a credit card machine.? If the shopping cart supports Paypal payment, the site should accept those also. Please note that shipping is free for the products.